JPH08148362A - Manufacturing method and apparatus for wire-wound chip-type inductor - Google Patents

Abstract

PURPOSE: To provide a method and apparatus with a good yield and efficiency for manufacturing a reliable wire-wound chip-type inductor that is easy to adjust its inductance, in which a manufacturing step is made automatic without using an insulating sheet and a surface grinding step for a core is eliminated. CONSTITUTION: On a carrying plate 23, a C-shaped angular core with a winding thereon is coated with an adhesive. A lead frame 1 set with an I-shaped core 3 and positioned by a positioning pin 16 is moved while a probe 17 put with an LCR meter on a probe mounting plate 26 is moved up and down on a plate 18. The plate 18 is moved vertically by a shaft 27 of a cylinder 21, a directly acting bush 20 and a guide shaft 19. While the probe 17 is put in contact with the core, the I-shaped core on the C-shaped angular core is put under pressure by moving down the pressurizing shaft 9, the inductance can be measured continuously by the probe 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for manufacturing a wire-wound chip inductor for forming a closed magnetic circuit used in electronic equipment.

[0002]

2. Description of the Related Art A conventional inductor manufacturing process includes a step of installing a U-shaped core on a lead frame, a step of adhering the U-shaped core, a step of winding the U-shaped core, and a step of winding the winding on the frame. A step of welding, a step of crimping the I-shaped core to the U-shaped core to measure the characteristics, a step of molding the I-shaped core to the U-shaped core, and a step of forming by cutting off the terminal of the frame and bending. And a step of inspecting characteristics, and the inductor is completed by going through them.

The process handled here is a process of measuring the inductance characteristic and adjusting the thickness of the adhesive of the U-shaped core and the I-shaped core in order to obtain the required inductance.

Conventionally, in the manufacturing process of the above-mentioned inductor, the manufacturing apparatus thereof uses a push-pull meter, and the tip of the push-pull meter is applied to pressurize the upper surface of the inductor. The U-shaped core and the I-shaped core were adhered and fixed by forming a gap between the core and the core and measuring the inductance.

In order to form these gaps, the surfaces of the U-shaped core and the I-shaped core were flat-polished and made flat, and then the insulating sheet was sandwiched between the U-shaped core and the I-shaped core.

[0006]

The above-described conventional inductor manufacturing process has a drawback that the surface of the core must be polished to obtain the inductance characteristic.

As the size of the inductor becomes smaller, the insulating sheet also becomes smaller, which makes it difficult to sandwich the insulating sheet between the U-shaped core and the I-shaped core.

The use of an insulating sheet has a drawback that automation is difficult and automation is difficult.

Further, the inductance of the inductor is adjusted by adjusting the number of turns of the winding and the gap between the U-shaped core and the I-shaped core, but the inductance cannot be finely adjusted only by the number of turns of the winding. Since it is necessary to adjust the gap between the U-shaped core and the I-shaped core, the yield is poor, the number of processes is increased, and the productivity is poor.

In addition, since the thickness of the insulating sheet is varied to adjust the gap, various types of insulating sheets must be prepared.

The object of the present invention is to eliminate these drawbacks,
Eliminating the step of core surface polishing, automation without the use of an insulating sheet, easy adjustment of inductance, good yield, high productivity, highly reliable wire-wound chip inductor manufacturing apparatus and its manufacturing To provide a method.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a motor, a cam plate operated by the motor, and a cam follower interlocking with the cam plate.
A U-shaped angle connected to the cam follower is arranged on a motor base provided with a linear motion guide, and the U-shaped angle includes a pressure spring, a pressure shaft, and a linear motion bush. A carrier plate is arranged directly under the carrier plate, an adhesive is applied to the wound U-shaped core on the carrier plate, and the lead frame having the I-shaped core is moved to move the cylinder and the guide shaft under the carrier plate. And move it up and down, arrange the probe mounting plate with the probe connected to the LCR meter, move the probe up and down with the cylinder, move the probe to the core, contact it, and pressurize at the same time. A winding chip characterized in that the probe continuously measures the inductance while lowering the shaft to press the I-shaped core on the U-shaped core. This is a device for manufacturing inductors. On the carrier plate, adhesive is applied to the coiled U-shaped core, the lead frame with the I-shaped core is moved, and it is directly below the core connected to the LCR meter. The arranged probe is moved up and down to be brought into contact with the core. Simultaneously with the contact, the inductance of the core is continuously measured by the probe while the I-shaped core on the U-shaped core is pressed by the pressing means. The present invention is a method for manufacturing a wire-wound chip inductor.

[0013]

In the device of the present invention, the probe connected to the LCR meter is brought into contact with the core, and at the same time, the core is pressurized, and the cam is pressurized until the inductance falls within the standard. It is configured to adjust the thickness of the adhesive while continuing to apply pressure. Further, when the inductance passes the standard, it has a function of reversing the motor to release the pressure. For this reason, it is not necessary to make adjustments with the insulating sheet, and therefore planar polishing is also unnecessary.
Further, since the load is applied by the amount of displacement of the spring, the load can be varied, the thickness of the adhesive can be freely adjusted, and the inductance can be adjusted smoothly. By providing the above-described device and the manufacturing method thereof, it is possible to manufacture a wire-wound chip inductor having a high quality, in which the inductance can be easily adjusted, the yield is high, and the productivity is high.

[0014]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an inductor in which a winding 28 is formed on the U-shaped core 2. FIG. 2 shows a wound inductor in which an adhesive is applied to the U-shaped core 2 and then the I-shaped core 3 is placed to form a closed magnetic circuit. FIG. 3 shows an overall perspective view of the manufacturing apparatus of the present invention.

As shown in FIG. 3, in the inductor manufacturing apparatus of this embodiment, the cam plate 12 is attached to the shaft 25 of the motor 15.

A linear guide 5 is attached to the motor base 4 at a central position on the upper portion of the motor 15 in parallel with the longitudinal direction, and a U-shaped angle 6 is attached to the linear guide 5. .

Further, the U-shaped angle 6 is provided with a cam follower 14 via a cam follower mounting plate 11, and the cam follower 14 is pressed against the cam plate 12 by the restraining spring 13 and the displacement amount of the cam plate 12 is increased. The U-shaped angle 6 moves up and down.

A linear bush 10 is attached to the U-shaped angle 6 and has a pressure shaft 9 therein. The pressure shaft 9 is pressed against the end face of the linear motion bush 10 by a pressure spring 8. The pressing force can be varied by moving the adjusting screw 7 up and down to compress the pressure spring 8 via the seat plate 22.

The lead frame 1 on which the I-shaped core 3 is placed moves on the carrier plate 23 and is sent.

The positioning pin 16 includes a shaft 27 of the cylinder 21, a direct acting bush 20 and a guide shaft 19.
It is attached to a plate 18 connected to the.

Further, the lead frame 1 is positioned by the positioning pin 16 so that the I-shaped core is located directly below the pressure shaft 9.

Positioning of the lead frame 1 is performed by vertically moving the plate 18 by a cylinder 21 and inserting a positioning pin 16 into a positioning hole 24 of the lead frame 1. After that, the probe 17 attached to the plate 18 comes into contact with the lead frame 1 to measure the inductor.

FIG. 4 is a side view for explaining the operation of this device. As shown in FIG. 4 (a), the lead frame 1 on which the U-shaped core and the I-shaped core 3 are mounted is lifted up by the plate 18 attached to the cylinder 21.
Positioning is performed by the positioning pin 16 attached to the plate 18, and the measurement of the inductor is started by the probe 17 provided on the probe mounting plate 26 and connected to the LCR meter.

Thereafter, as shown in FIG. 4B, the motor 15 is rotated, and the cam plate 12 attached to the motor 15 is also rotated. Due to the rotation of the cam plate 12, the cam follower 14 starts to move down in accordance with the amount of displacement of the cam, and along with that, the U-shaped angle 6 and the pressure shaft 9 also move down.

Thereafter, a load is applied more than when the pressing shaft 9 comes into contact with the I-shaped core 3.

As shown in FIG. 4 (c), the cam plate 1 is further added.
The rotation of 2 causes the U-shaped angle 6 to descend according to the amount of cam displacement due to the restraining spring, but the pressing shaft 9 is in contact with the I-shaped core 3 and does not descend further.

Therefore, the pressurizing shaft 9 presses the pressurizing shaft 9 against the direct-acting bush 10 while maintaining its position, using the direct-acting bush 10 attached to the U-shaped angle 6 as a guide. The deflection and the load applied to the I-shaped core 3 are increased by the deflection amount of the pressure spring 8.

That is, the amount of displacement of the cam becomes the amount of deflection of the pressure spring 8 and the load on the I-shaped core 3. At that time, when the specified inductor is reached, the load is released by stopping the motor and rotating it in the reverse direction. Therefore, it becomes possible to manufacture a product having a specified inductor.

FIG. 5 is a diagram showing the relationship between the load and the inductance. As shown in FIG. 5, the initial load applied to the I-shaped core can be changed by the adjusting screw. Further, even if the specifications change, the initial load can be changed without converting the pressure spring body.

[0031]

As described above, according to the present invention,
Eliminating the step of core surface polishing, automation without the use of an insulating sheet, easy adjustment of inductance, high yield, good productivity, and highly reliable wire-wound chip inductor manufacturing apparatus and its manufacture Could provide a way.

[Brief description of drawings]

FIG. 1 is a perspective view showing an inductor in which a U-shaped core is wound.

FIG. 2 is a perspective view showing an inductor in which a U-shaped core and an I-shaped core are bonded to form a closed magnetic circuit.

FIG. 3 is an overall perspective view of the manufacturing apparatus of the present invention.

FIG. 4 is a side view projected from the side for explaining the operation of the apparatus. FIG. 4A is a side view showing a state where the probe is in contact with the U-shaped core and the probe mounting plate is separated. FIG.
(B) is a side view of a state where the probe and the probe mounting plate are in contact with the U-shaped core. FIG. 4C is a side view showing a state in which the pressure shaft pressurizes after the probe and the probe mounting plate contact the U-shaped core.

FIG. 5 is a diagram showing a relationship between load and inductance.

[Explanation of symbols]

 1 lead frame 2 U-shaped core 3 I-shaped core 4 motor base 5 linear guide 6 U-shaped angle 7 adjusting screw 8 pressure spring 9 pressure shaft 10, 20 linear motion bush 11 cam follower mounting plate 12 cam plate 13 restraining spring 14 Cam follower 15 Motor 16 Positioning pin 17 Probe 18 Plate 19 Guide shaft 21 Cylinder 22 Seat plate 23 Transfer plate 24 Positioning hole 25 Axis 26 Probe mounting plate 27 Shaft 28 Winding

Claims (2)

[Claims] 1. A motor, a cam plate operated by the motor, a cam follower that interlocks with the cam plate, and a U-shaped angle connected to the cam follower are arranged on a motor base provided with a linear guide. The U-shaped angle is provided with a pressure spring, a pressure shaft, and a direct-acting bush, and a conveying plate is arranged directly below the pressure shaft,
On the carrier plate, an adhesive is applied to the wound U-shaped core, the lead frame having the I-shaped core is moved, and the cylinder and the guide shaft are moved up and down under the carrier plate to obtain an LCR meter. A probe mounting plate with a probe connected to it is arranged, and the probe is moved up and down with a cylinder to move and abut the probe to the core. An apparatus for manufacturing a wire-wound chip inductor, wherein inductance is continuously measured with the probe while pressing the upper I-shaped core. 2. A U-shaped core provided with a winding is coated with an adhesive on a carrier plate, a lead frame having an I-shaped core is moved, and the lead frame is arranged directly below the core connected to an LCR meter. The probe is moved up and down to be brought into contact with the core, and at the same time as the contact is made, the inductance of the core is continuously measured by the probe while the I-shaped core on the U-shaped core is being pressed by the pressing means. A method for manufacturing a wire-wound chip inductor having the characteristics.